In perfect elastic collision
Correct answer: D. Momentum, kinetic energy, and total energy is conserved
- A. Only momentum is conserved
- B. Only total energy is conserved
- C. Only kinetic energy is conserved
- D. Momentum, kinetic energy, and total energy is conserved
Explanation
Kinetic energy and hence momentum is conserved only in elastic collision. The kinetic energy is not conserved in inelastic collisions but the total energy is conserved in all types of collisions.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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About Collisions
Collisions involve the conservation of linear momentum when bodies interact for a short time. The topic covers impulse, elastic and inelastic collisions, kinetic energy changes, and the coefficient of restitution, with calculations usually based on one dimensional motion. Momentum remains conserved in isolated collisions, but kinetic energy is conserved only in elastic collisions.
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